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Thursday, March 27, 2008

Sandstone is an arenaceous sedimentary rock composed mostly of feldspar and quartz and varies in colour (in a similar way to sand), through grey, yellow, red, and white. Since sandstones often form extremely visible cliffs and other rock formations, certain colors of sandstone may be strongly identified with certain regions. For instance, much of the North American West is familiar for its red sandstones.Halloween Costumes

Monday, March 10, 2008

A planet,is a extraterrestrial body orbiting a star or stellar remnant that is massive adequate to be rounded by its own gravity, not massive enough to cause thermonuclear fusion in its core, and has cleared its neighbouring region of planetesimals

After stars and stellar remnants, planets are a few of the most massive objects known to man. They play an important part in the structure of planetary systems, and are also considered, along with large moons, the most feasible environment for life. Thus planetary science is crucial not only to comprehend the structure of the universe, but also to better understand the development of life, and to aid the search for extraterrestrial intelligence. Additionally, the planets visible from Earth have played a vital role in the shaping of human culture, religion and philosophy in abundant civilisations. Even today, many people continue to believe true the movement of the planets affects their lives, all though such a causation is discarded by the scientific community.

Monday, March 03, 2008

Orchids (Orchidaceae family) are among the biggest and most diverse of the flowering plant (angiospermae) families, with over 800 described genera and 25,000 (some sources give 30,000) species, and another 100,000 + hybrids and cultivars formed by horticulturalists. The Kew World Checklist of Orchids includes about 24,000 conventional species. As regards 800 new species are added each year. Orchids, through their floral complexity and their connections with pollinators and their symbiosis with mycorrhizae, are considered by some, along with the grasses, to be examples of the most difficult floral evolution known.